title: Communication: Protein dynamical transition vs. liquid-liquid phase transition in protein hydration water.
abstract: In this work, we compare experimental data on myoglobin hydrated powders from elastic neutron scattering, broadband dielectric spectroscopy, and differential scanning calorimetry. Our aim is to obtain new insights on the connection between the protein dynamical transition, a fundamental phenomenon observed in proteins whose physical origin is highly debated, and the liquid-liquid phase transition (LLPT) possibly occurring in protein hydration water and related to the existence of a low temperature critical point in supercooled water. Our results provide a consistent thermodynamic/dynamic description which gives experimental support to the LLPT hypothesis and further reveals how fundamental properties of water and proteins are tightly related.
authors.affiliation: Department of Physics and Chemistry, University of Palermo, Via Archirafi 36, 90123 Palermo, Italy.
authors.forename: Giorgio
authors.initials: G
authors.lastname: Schirò
authors.forename: Margarita
authors.initials: M
authors.lastname: Fomina
authors.forename: Antonio
authors.initials: A
authors.lastname: Cupane
mesh_terms: D009211:Myoglobin / Q000737:chemistry*; D044367:Phase Transition; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*
chemical_list: D009211:Myoglobin; D014867:Water